Electronics > Beginners
MOSFETS as voltage controlled gates
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mvs:

--- Quote from: Faloude on November 18, 2018, 05:36:18 pm ---Got it! How are those intervals (0.1V) set? I know, I should read the PDF.  ^-^

--- End quote ---
I draw a schematic for this case with formulas.
SolderOcelot:
Much appreciated MVS! I have some questions on this diagram.

Where is ground of J1?
What is C1?
If there were no resistence on RLO and RHI lines, what would the voltage be?
Mechatrommer:
another thought comparator based, maybe half the BOM price, ymmv...
mvs:

--- Quote from: Faloude on November 18, 2018, 10:11:36 pm ---Much appreciated MVS! I have some questions on this diagram.

Where is ground of J1?
What is C1?
If there were no resistence on RLO and RHI lines, what would the voltage be?

--- End quote ---
1. It is GND
2. C1 is a decoupling capacitor. TI recommends 2.2µF tantalum or 10µF aluminum electrolytic capacitor, but you can use also MLCC ceramic.
3. If you remove R1 and short out R2 and R3 you will get V_RHI=1.25V and V_RLO=0V. LED current will be quite low, I=12.5/10K=1.25mA.
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